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            <h1 class="title">node&#43;koa获取微信授权拿到openid</h1>
            <section class="info">
                <span class="avatar" style="background-image: url(https://pic1.58cdn.com.cn/nowater/webim/big/n_v2a9773b605e754c8493cf53ca8f5c0d7e.jpg);"></span> <a class="name" href="javascript:;">江矿先森.</a> 
                <span class="date"><script>document.write(dateFormat( 1525947834 *1000, 'yyyy-MM-dd'))</script></span> 
                <span class="tags"><a class="tages" href="/tag/Node/index.html">Node</a><a class="tages" href="/tag/Koa2/index.html">Koa2</a></span>
            </section>
            <article class="content"><h4>流程步骤</h4>

<ul>
<li>用户同意，获取code。</li>
<li>通过code获取网页授权access_token.</li>
<li>获取用户信息。</li>
</ul>

<h4>开始搞事情 :p</h4>

<pre><code class="language-js">import Koa from 'koa'
import path from 'path'
import route from 'koa-route'
import static from 'koa-static'
import keyBody from 'koa-body'

const app = new Koa()

// 路由
import oauth from './routes/accredit/oauth'
import token from './routes/accredit/token'
const rootPath = path.join(__dirname + '/View')
const _static = static(rootPath)
// 中间件
const logger = async(ctx, next) =&gt; {
    const rt_start = Date.now()
    await next()
    const rt_end = Date.now()
    ctx.set('X-Response-Time', `${rt_end - rt_start}ms`);
    console.log(ctx.request.method, ctx.url, `${rt_end - rt_start}ms`)
}

app.use(_static) // 静态资源
app.use(keyBody()) // req body数据获取 (非参数序列化)
app.use(logger) // 日志

// page route
app.use(route.get('/oauth', oauth)); //授权
app.use(route.get('/token', token)); //获取openid

app.listen(8088, (err) =&gt; {
    if (err) { console.error(err) }
    console.log('Listening At:', 8088)
}
</code></pre>

<h4>1.在APP中访问oauth获取code</h4>

<pre><code class="language-js">import config from './../config'
import request from 'request'
/* 微信网页授权 */
const oauth = async(ctx, next) =&gt; {
    const { request: req, response: res } = ctx;        
　　 var AppID = config.AppID;
        var AppSecret = config.AppSecret;
        // 第一步：用户同意授权，获取code
        var Router = 'jy';
        // 这是编码后的地址
        var return_uri = config.return_uri + Router;
        var scope = 'snsapi_base';
        // snsapi_userinfo可以获取用户信息与token与openid
        // snsapi_base只能获取到token与openid
        res.redirect('https://open.weixin.qq.com/connect/oauth2/authorize?appid=' + AppID + '&amp;redirect_uri=' + return_uri + '&amp;response_type=code&amp;scope=' + scope + '&amp;state=123456#wechat_redirect');
}
module.exports = { oauth };
</code></pre>

<p>config.js里面写好以下配置参数
-  AppID
- AppSecret</p>

<h4>2、在客户端访问 tocken,tongguo code获取access_tocken</h4>

<pre><code class="language-js">import config from './../config'
import request from 'request'
import axios from 'axios'

const token = async(ctx, next) =&gt; {
    const { request: req, response: res } = ctx
    var code = req.header.referer.match(new RegExp(&quot;[\?\&amp;]&quot; + 'code' + &quot;=([^\&amp;]+)&quot;, &quot;i&quot;))[1];
    var AppID = config.AppID;
    var AppSecret = config.AppSecret;
    var result = await request.get({
            url: 'https://api.weixin.qq.com/sns/oauth2/access_token?appid=' + AppID + '&amp;secret=' + AppSecret + '&amp;code=' + code + '&amp;grant_type=authorization_code',
        },
        function(error, response, body) {
            if (response.statusCode == 200) {
                // 第三步：拉取用户信息(需scope为 snsapi_userinfo)
                // console.log(JSON.parse(body));
                var data = JSON.parse(body);
                var access_token = data.access_token;
                var openid = data.openid;
            } else {
                console.log(response.statusCode);
            }
        }
    );
    ctx.type = 'json';
    ctx.body = result;
}

module.exports = { token }
</code></pre>

<p>我这里只需要获取到openid即可，所以在这里就已经返回result。</p>
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